KNS Perma Pin Firing Pin Retainer for M-16 & AR-15

KNS Perma Pin Firing Pin Retainer for M-16 & AR-15

The KNS Perma-Pin Firing Pin Retainer for the M-16 and AR-15 replaces the standard cotter pin found in the bolt carrier to retain the firing pin (as in original Stoner rifles). made of tool steel. No modification to gun required.